Fixing indexed_db test on IE & Safari

tests/html/indexeddb_1_test.dart

 library IndexedDB1Test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:async';
 import 'dart:html' as html;
 import 'dart:indexed_db' as idb;
 import 'utils.dart';
 
 const String DB_NAME = 'Test';
 const String STORE_NAME = 'TEST';
@@ skipping 110 matching lines @@
       expect(idb.IdbFactory.supported, true);
     });
   });
 
   group('functional', () {
     test('throws when unsupported', () {
       var expectation = idb.IdbFactory.supported ? returnsNormally : throws;
 
       expect(() {
         var db = html.window.indexedDB;
+        db.open('random_db');
       }, expectation);
     });
 
     // Don't bother with these tests if it's unsupported.
     if (idb.IdbFactory.supported) {
       futureTest('upgrade', testUpgrade);
       tests_dynamic();
       tests_typed();
     }
   });
 }